Package structure and method of manufacturing the same

1. A package structure, comprising: a die; an encapsulant, laterally encapsulating the die; a polymer layer on the encapsulant and the die, wherein the polymer layer comprises an extending portion having a bottom surface lower than a top surface of the die, and the polymer layer has a substantially flat top surface, wherein the extending portion of the polymer layer extends into a filler of the encapsulant; and a redistribution layer penetrating through the polymer layer to connect to the die.

2. The package structure of claim 1 , wherein the extending portion of the polymer layer is laterally surrounded by the filler of the encapsulant.

3. The package structure of claim 1 , wherein the extending portion of the polymer layer is in contact with an inner sidewall of the filler.

4. The package structure of claim 1 , wherein the polymer layer comprises a first portion directly on the die, and a second portion comprising the extending portion which is directly on a portion of the encapsulant, a second thickness of the second portion is larger than a first thickness of the first portion.

5. The package structure of claim 1 , wherein the encapsulant has a first pit, and the extending portion of the polymer layer is filled in the first pit.

6. The package structure of claim 5 , wherein the polymer layer has a second pit directly over the first pit, and a height of the second pit is less than a height of the first pit.

7. The package structure of claim 5 , wherein the polymer layer is free of pit directly over the first pit.

8. The package structure of claim 1 , wherein the redistribution layer comprises a via embedded in the polymer layer and a trace extending on a top surface of the polymer layer; and a base angle of the via is a right angle or an acute angle.

9. The package structure of claim 8 , wherein a top surface of the via is lower than a top surface of the polymer layer.

10. A package structure, comprising: a first die, comprising a first connector and a first protection layer laterally aside the first connector, the first connector comprises a first seed layer and a first conductive post, wherein the first conductive post is disposed on and laterally surrounded by the first seed layer; an encapsulant, laterally encapsulating the first die; and a redistribution layer (RDL) structure on the first die and the encapsulant, wherein the first seed layer is in contact with the RDL structure.

11. The package structure of claim 10 , wherein a portion of the first seed layer is laterally sandwiched between the first conductive post and the first protection layer and has a top surface in contact with the RDL structure.

12. The package structure of claim 10 , wherein the first conductive post is separated from the first protection layer by the first seed layer therebetween.

13. The package structure of claim 10 , wherein a portion of the encapsulant is laterally between a polymer layer of the RDL structure and the first protection layer.

14. The package structure of claim 10 , wherein the RDL structure comprises a polymer layer covering the die and the encapsulant, and a surface roughness of a top surface of the polymer layer is less than a surface roughness of a top surface of the encapsulant.

15. The package structure of claim 10 , further comprising: a second die laterally aside the first die and encapsulated by the encapsulant, the second die comprises a second connector and a second protection layer laterally aside the second connector, the second connector comprises a second seed layer and a second conductive post on the second seed layer; wherein the second seed layer is separated from the RDL structure by the second conductive post therebetween.

16. A method of forming a package structure, comprising: forming a die comprising a connector and a protection layer laterally aside and surrounding the connector, wherein the connector is formed after forming the protection layer, the connector comprises a seed layer and a conductive post, wherein the conductive post is disposed on and laterally surrounded by the seed layer; forming an encapsulant to laterally encapsulate the die; and forming a RDL structure on the die and the encapsulant, wherein the seed layer is in contact with the RDL structure.

17. The method of claim 16 , wherein forming the protection layer comprises: forming a protection material layer to cover a conductive pad of the die; patterning the protection material layer to form the protection layer; and performing a curing process to cure the protection layer, wherein a shrinkage rate of protection layer after the curing process with respect to the protection material layer before the curing process ranges from 0 to 2%.

18. The method of claim 17 , wherein forming the protection material layer comprises performing a soft bake process on the protection material layer, and the curing process is performed at a temperature higher than that of the soft bake process.

19. The method of claim 17 , wherein patterning the protection material layer comprises forming an opening in the protection layer exposing the conductive pad of the die, and the connector is formed on the conductive pad within the opening of the protection layer.

20. The method of claim 19 , wherein forming the connector comprises: forming a seed material layer on the protection layer and filling into the opening; forming a conductive material layer on the seed material layer and filling into the opening; and performing a patterning process to remove portions of the seed material layer and the conductive material layer over a top surface of the protection layer.